Monowheel Bikes
These have been around for a while in various forms. The patent application for one's concept from 1869 is visible. So why don't they already exist? There are a few contributing aspects, but gerbiling is by far the funniest and most important. Have you ever seen a gerbil moving around in a cage on its tiny wheel? And at some point, either he acquires too much more speed or perhaps slides, causing the gerbil to lose all ability to move and become stuck to the still spinning wheel? It occurs to riders of monowheel motorcycles.
The person in the center of the monowheel frame turns into a helpless and helpless gerbil when applied force surpasses gravitational force. This may occur if the bike brakes abruptly or even if it accelerates too quickly.
The bikes' attraction is further constrained by their extremely unsteady stability and the enormous obstacle that is directly in front of you when you ride one. However, it's difficult to even worry about anything else once you've struck the gerbil thing.